考虑影响线模型修正的既有连续梁桥地震易损性评价方法  

Existing continuous beam bridges seismic vulnerability assessment method considering with model modification based on influence line

作　　者：周宇 甘露一 狄生奎 陈东 方登甲 ZHOU Yu;GAN Luyi;DI Shengkui;CHENG Dong;FANG Dengjia(College of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;National-local Joint Engineering Laboratory of Building Health Monitoring and Disaster Prevention Technology,Anhui Jianzhu University,Hefei 230601,China;Operation and Monitoring Center for Hefei Urban Safety&Security,Hefei 230601,China)

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601 [2]兰州交通大学土木工程学院,甘肃兰州730070 [3]安徽建筑大学建筑健康监测与灾害预防技术国家地方联合工程实验室,安徽合肥230601 [4]合肥市城市生命线工程安全运行监测中心,安徽合肥230601

出　　处：《振动工程学报》2025年第4期838-848,共11页Journal of Vibration Engineering

基　　金：安徽省高校科学研究重点项目(2022AH050248);甘肃省建设科技项目(JK2023-03);安徽省自然科学基金青年项目(2008085QE247);安徽省高校优秀拔尖人才培育项目(gxgnfx2022021);企业委托技术开发课题(HYB20220240,HYB20230001);建筑健康监测与灾害预防技术国家地方联合工程实验室主任基金资助项目(GG22KF002);甘肃省重点研发计划-工业类项目(23YFGA0043)。

摘　　要：影响线是桥梁结构弹性力学状态的重要表征参数,能够有效反映结构的抗力与抗变形性能,并有望用于地震期间弹塑性响应的评估与预测。以某实测三跨钢板组合连续梁桥影响线为模型修正目标,基于BP神经网络开展桥梁模型修正研究;进一步构建不同峰值地面加速度下的墩柱弯矩⁃曲率指标,以Beta分布的期望为震害指数,拟合桥梁模型在多种性能水平下结构的超越概率表达式,分析对比连续梁桥结构有限元修正前、后的地震易损性。结果表明,有限元模型修正理论可使实测值与计算值间的相对误差从38%降低至10%以内,有限元修正模型比初始模型的震害指数更低;通过引入Beta分布对不同性能水平进行加权融合,可将结构的易损性矩阵转化为震害指数,从而综合考虑不同破坏等级的危害后果,更为全面地展现桥梁结构的抗震性能。The influence line is an important parameter of the elastic mechanical state of the bridge structure,which can effectively reflect the resistance and deformation resistance of the structure,and is expected to be used to evaluate and predict the elastic-plastic response during earthquakes.Taking the influence line of a three-span steel plate composite continuous beam bridge as the model correction target,the bridge model correction research is carried out based on BP neural network.With the expectation of Beta distribution as the earthquake damage index,the overtaking probability expression of the bridge model under various performance levels is fitted,and the seismic vulnerability of the continuous beam bridge structure before and after the finite element modification is analyzed and compared.The results show that the relative error between the measured value and the calculated value can be reduced from 38%to less than 10%,and the earthquake damage index of the modified finite element model is lower than that of the initial model.By incorporating the Beta distribution to weight and integrate different performance levels,the structural vulnerability matrix can be transformed into a seismic damage index,thereby accounting for the damage consequences of different failure levels and providing a more comprehensive representation of the seismic performance of the bridge structure.

关 键 词：桥梁工程 地震易损性 增量动力分析 应变影响线 模型修正 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]